JMHO but replacing OEM mufflers with any slip ons should not require a tune. Be advised that if you are expecting the low "rumble" that most are looking for by replacing OEM mufflers with a set of slip ons, you will be disappointed with the fish tail sound which is often described as a "high pitch kackle". If you just want the fish tail look, Samson probably has the best sounding fish tail slipons but they will still not have that Harley rumble.
If you want great sound and a little boost in performance, take a look at the Khrome Werks offerings. Another option you might consider is replacing the baffles in the OEM mufflers; I recall if that year and model had the cats in the mufflers but if not; Fullsac and Big City Thunder offer baffles.